Subzero: Control memory growth from local label fixups.

src/IceAssemblerARM32.cpp

Index: src/IceAssemblerARM32.cpp
diff --git a/src/IceAssemblerARM32.cpp b/src/IceAssemblerARM32.cpp
index 11175373c63620dc70546d7ee55cb734cf7140fb..613fa7772b78d58ca188bdfdf50a74c32db844c4 100644
--- a/src/IceAssemblerARM32.cpp
+++ b/src/IceAssemblerARM32.cpp
@@ -593,11 +593,16 @@ size_t MoveRelocatableFixup::emit(GlobalContext *Ctx,
   IValueT Inst = Asm.load<IValueT>(position());
   const bool IsMovw = kind() == llvm::ELF::R_ARM_MOVW_ABS_NC ||
                       kind() == llvm::ELF::R_ARM_MOVW_PREL_NC;
+  const IceString Symbol = symbol();
+  const bool NeedsPCRelSuffix =
+      (Asm.fixupIsPCRel(kind()) || Symbol == GlobalOffsetTable);
   Str << "\t"
          "mov" << (IsMovw ? "w" : "t") << "\t"
       << RegARM32::getRegName(RegNumT::fixme((Inst >> kRdShift) & 0xF))
-      << ", #:" << (IsMovw ? "lower" : "upper") << "16:" << symbol(&Asm)
-      << "\t@ .word " << llvm::format_hex_no_prefix(Inst, 8) << "\n";
+      << ", #:" << (IsMovw ? "lower" : "upper") << "16:" << Symbol
+      << (NeedsPCRelSuffix ? " - ." : "") << "\t@ .word "
+      // TODO(jpp): This is broken, it also needs to add a magic constant.
+      << llvm::format_hex_no_prefix(Inst, 8) << "\n";
   return InstARM32::InstSize;
 }
 
@@ -650,7 +655,7 @@ size_t BlRelocatableFixup::emit(GlobalContext *Ctx,
   Ostream &Str = Ctx->getStrEmit();
   IValueT Inst = Asm.load<IValueT>(position());
   Str << "\t"
-         "bl\t" << symbol(&Asm) << "\t@ .word "
+         "bl\t" << symbol() << "\t@ .word "
       << llvm::format_hex_no_prefix(Inst, 8) << "\n";
   return InstARM32::InstSize;
 }